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1) <Abstract> This study examined the effects of investor sentiment and limits-to-arbitrage on the idiosyncratic volatility (IVOL) puzzle in the Korean stock market. The IVOL portfolio analysis revealed that IVOL is negatively associated with stock returns. It indicates the existence of the IVOL puzzle in the Korean stock market. Additionally, the IVOL puzzle observed in the Korean stock market is time-varying. Therefore, this study analyzed whether the IVOL return premium becomes stronger due to investor sentiment and limits-to-arbitrage. According to the results, all the investor sentiment portfolios had a negative IVOL return premium regardless of whether investor sentiment was high or low, and no patterns of the IVOL puzzle due to investor sentiment were found. On the other hand, the IVOL puzzle is observed when limits-to-arbitrage were high as compared to when they were low. Furthermore, the higher the limits-to-arbitrage, the higher the negative IVOL return premium. These results suggest that the IVOL puzzle is caused by stocks with high limits-to-arbitrage and is intensified when limits-to-arbitrage are high.

The Effects of Investor Sentiment and Limits-to-Arbitrage on the Idiosyncratic Volatility Puzzle